JP2013194086A - Resin composition and resin molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition having excellent impact resistance and opacifying properties of a resin molded product to be obtained.SOLUTION: A resin composition includes a polycarbonate resin, a titanium compound and a zinc compound in which the content Ct of a titanium element derived from the titanium compound is ≥0.1 mass% and ≤5 mass% based on the whole resin composition, the content Cz of a zinc element derived from the zinc compound is ≥0.2 ppm and ≤10 ppm based on the whole resin composition and a mercury content is ≤100 ppm based on the whole resin composition.

Description

  The present invention relates to a resin composition and a resin molded body.

Conventionally, as a thermoplastic resin used for molding a resin molded body,

Moreover, various things are provided as a thermoplastic resin composition used for formation of a resin molding.
For example, in order to improve impact resistance strength and surface impact strength, a method of adding polylactic acid or titanium oxide to a polycarbonate resin has been proposed (for example, see Patent Document 1).
Further, in order to improve various properties, addition of a filler or the like in addition to the resin has been proposed. For example, condensed phosphoric acid, stearic acid metal salt, polylactic acid and talc (for example, see Patent Document 2) are used to improve mechanical properties, heat resistance and flame retardancy, and silicon dioxide and oxidation are used to improve flame retardancy. An example of adding aluminum has been proposed (see, for example, Patent Document 3).
Furthermore, an example in which antimony or germanium is added for the purpose of improving color tone and heat resistance has been proposed (see, for example, Patent Document 4).

JP 2009-144075 A JP 2009-126870 A JP 2008-001903 A JP 2010-031175 A

  The subject of this invention is providing the resin composition excellent in the impact resistance and concealment property of the resin molding obtained.

The above object is achieved by the present invention described below.
That is, the invention according to claim 1
A polycarbonate resin, a titanium compound, and a zinc compound,
The content Ct of titanium element derived from the titanium compound is 0.1% by mass or more and 5% by mass or less with respect to the entire resin composition,
The resin composition whose content Cz of the zinc element derived from the said zinc compound is 0.2 ppm or more and 10 ppm or less with respect to the whole resin composition.

The invention according to claim 2
The resin composition according to claim 1, wherein the mercury content is 100 ppm or less based on the entire resin composition.

The invention according to claim 3
The resin composition according to claim 1, wherein the titanium compound is titanium oxide.

The invention according to claim 4
The resin composition according to any one of claims 1 to 3, wherein the zinc compound is a zinc salt of an acid.

The invention according to claim 5
The resin molded object comprised including the resin composition of any one of Claims 1-4.

According to the first, third, and fourth aspects of the invention, in the resin composition containing the polycarbonate resin, the titanium compound, and the zinc compound, the content Ct of the titanium element derived from the titanium compound or the zinc element derived from the zinc compound. As compared with the case where the content Cz is out of the above range, a resin composition excellent in impact resistance and concealing property of the obtained resin molded body can be provided.
According to the invention which concerns on Claim 2, compared with the case where mercury contains more than 100 ppm with respect to the whole resin composition, the resin composition by which the color change with time of the obtained resin molding was suppressed can be provided.

  According to the invention which concerns on Claim 5, in the resin composition containing a polycarbonate resin, a titanium compound, and a zinc compound, the content Ct of the titanium element derived from the titanium compound or the content Cz of the zinc element derived from the zinc compound is Compared to the case where the resin composition is out of the above range, a resin molded article excellent in impact resistance and concealment can be provided.

It is a schematic diagram which shows an example of the components of an electronic / electric equipment provided with the resin molding which concerns on this embodiment.

  Embodiments that are examples of the present invention will be described below.

[Resin composition]
The resin composition according to the present embodiment includes a polycarbonate, a titanium compound, and a zinc compound.
And content Ct of the titanium element derived from a titanium compound is 0.1 to 5 mass% with respect to the whole resin composition.
Moreover, content Cz of the zinc element derived from a zinc compound is 0.2 ppm or more and 10 ppm or less with respect to the whole resin composition.

Conventionally, a polycarbonate resin is known as a material having high impact resistance. And since polycarbonate resin is not bad in colorability, it is widely used as a material for obtaining a resin molding.
On the other hand, a titanium compound typified by titanium oxide is known as a material for obtaining a white resin molded body having high concealability.

However, since the dispersibility of the titanium compound with respect to the polycarbonate resin is not necessarily good, an aggregate of the titanium compound is generated inside the resin, and the impact resistance tends to be reduced in a portion where the aggregate is large. Moreover, when the aggregate of a titanium compound arises inside resin, the concealment property of the resin molding obtained may fall.
For this reason, increasing the compounding amount of the titanium compound improves the concealability, but the dispersibility of the titanium compound further deteriorates and the impact resistance tends to further deteriorate. Further, when the mechanical dispersion force is increased to improve the dispersibility of the titanium compound, the dispersibility is improved, but the molecular chain of the polycarbonate resin tends to be broken. Impact properties may be reduced.
In particular, when a polycarbonate resin and a resin other than a polycarbonate resin are mixed, the titanium compound is likely to be present at the interface between these resins. As a result, the dispersibility of the titanium compound is further deteriorated and the impact resistance is deteriorated. May end up.

Therefore, in the resin composition according to the present embodiment, the titanium compound is blended with respect to the system containing the polycarbonate resin so that the content Ct of the titanium element derived therefrom is within the above range, and the zinc compound is derived therefrom. It mix | blends so that content of a zinc element may become the said range.
And by the said composition, in the resin composition which concerns on this embodiment, it becomes what was excellent in the impact resistance of the resin molding obtained, and concealment property. Although this reason is not certain, it is thought to be due to the following reasons.

First, titanium compounds generally have a property that charging is difficult to occur. On the other hand, since the zinc compound exhibits a strong positive chargeability, the presence of a small amount of the zinc compound in the above range makes the titanium compound more negatively charged, and the electric repulsion between the titanium compounds causes the cohesiveness. It is thought to decline. At the same time, since the dispersed titanium compound is electrically drawn with respect to a small amount of zinc compound, it is considered that the dispersibility of the titanium compound is improved by the presence of the zinc compound.
Note that the amount of the zinc compound is very small relative to the titanium compound because the zinc compound is likely to be positively charged as described above, so that it is sufficient to make the titanium compound negatively charged.

  Therefore, when a compound containing a polycarbonate resin is blended with an amount of a titanium compound in which the resulting resin molding obtains concealing properties, and a small amount of a zinc compound is blended at the same time, the cohesiveness of the titanium compound decreases, and the resulting resin It is considered that the concealability is enhanced while maintaining the impact resistance of the molded body.

  From the above, it is considered that the resin composition according to this embodiment is excellent in impact resistance and concealing property of the obtained resin molded body.

  Hereinafter, the detail of each component of the resin composition which concerns on this embodiment is demonstrated.

(resin)
-Polycarbonate resin-
The polycarbonate resin is not particularly limited, and examples thereof include those having (—O—R—OCO—) as a repeating unit. Examples of R include diphenylpropane and P-xylene. -O-R-O is not particularly limited as long as it is a dioxy compound.
Specific examples of the polycarbonate resin include aromatic polycarbonates such as bisphenol A polycarbonate, bisphenol S polycarbonate, and biphenyl polycarbonate.
The polycarbonate resin may be a copolymer with silicone or undecamic acid amide.

  The weight average molecular weight of the polycarbonate resin is not particularly limited, but is preferably, for example, 5000 to 300,000, more preferably 10,000 to 200,000. If the weight average molecular weight of the polycarbonate resin is less than the above range, the heat resistance of the resin molded product tends to be reduced, and if it exceeds the above range, the impact resistance of the resin molded product tends to be reduced.

  The content of the polycarbonate resin is preferably 50% by mass to 90% by mass and more preferably 60% by mass to 90% by mass with respect to the entire resin composition. When the content of the polycarbonate resin is within the above range, the intended impact resistance of the resin molded product tends to be realized.

-Other resins-
Other resins other than the polycarbonate resin may be contained to such an extent that the properties of the resin composition are not deteriorated.
Other resins include, for example, aromatic polyester polymer compounds such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and copolymers thereof, bisphenol A / terephthalic acid type polyarylate, bisphenol S / terephthalate. Polyarylate polymers such as acid type polyarylate, biphenyl / terephthalic acid type polyarylate, bisphenol A / naphthalenedicarboxylic acid type polyarylate and copolymers thereof, polymethyl methacrylate, polybutyl methacrylate, polymethyl acrylate, Each component ratio of acrylic polymer compounds such as polybutyl acrylate and their copolymers, acrylonitrile (A), butadiene (B), styrene (S) A ABS-based polymer compound, 6-nylon, 6,6-nylon and polyamide-based polymer compounds such as copolymers thereof.

(Titanium compound)
As the titanium compound, titanium oxide is preferable from the viewpoint of high refractive index, concealment of the resin molded product, and high whiteness.

  Examples of titanium oxide include rutile type, anatase type, brookite type titanium oxide and the like. Among these, as the titanium oxide, rutile type titanium oxide is preferable from the viewpoint of high refractive index, concealment of the resin molded product, and high whiteness.

  Titanium oxide may be surface-treated with a hydrous oxide of aluminum or silicon produced by a chlorine method. In this case, particularly when a polycarbonate resin and a resin other than the polycarbonate resin are used in combination, it is advantageous in that the compatibility of the resin is increased.

  Examples of the method for producing titanium oxide include a method using a sulfuric acid method in which ilmenite is dissolved in sulfuric acid to separate impurities, and titanyl sulfate is hydrolyzed to produce titanium oxide. As a specific example, first, an ilmenite ore is pulverized and then reacted with sulfuric acid to be converted into a water-soluble sulfate. Impurities such as iron are removed by allowing the aqueous solution containing titanyl sulfate to stand and filter. Thereafter, titanyl sulfate is heated and hydrolyzed to precipitate it as insoluble white titanium hydroxide, neutralized and washed, and then dried, fired and then pulverized. Through these steps, titanium oxide particles are obtained. The amount of mercury contained in titanium oxide is reduced by increasing the number of times of precipitation and neutralization washing.

The volume average particle size of the titanium compound is preferably 0.1 μm or more and 0.5 μm or less, more preferably 0.2 μm or more and 0.3 μm or less.
When the volume average particle size of the titanium compound is less than the above range, aggregation of the titanium compounds is likely to occur, and the concealability of the resin molded product tends to be reduced. Moreover, when the volume average particle diameter of the titanium compound exceeds the above range, the impact strength tends to decrease.
In addition, the volume average particle diameter of the titanium compound is measured with a laser diffraction particle size distribution analyzer (LA-920, manufactured by Horiba, Ltd.).

The content Ct of the titanium element derived from the titanium compound is 0.1% by mass or more and 5% by mass or less, preferably 0.1% by mass or more and 2% by mass or less, more preferably 0% with respect to the entire resin composition. It is 1 mass% or more and 1 mass% or less.
When the content Ct of the titanium element is less than the above range, the concealability of the resin molded product is lowered. On the other hand, when the content Ct of the titanium element exceeds the above range, the impact resistance of the resin molded product is lowered.

  In addition, in order to make content Ct of titanium element into the said range, when converted into content of the titanium oxide as a titanium compound, for example, it is 0.18 mass% or more and 8.8 mass with respect to the whole resin composition. % Or less, preferably 0.18 mass% or more and 3.5 mass% or less, more preferably 0.18 mass% or more and 1.8 mass% or less.

(Zinc compound)
Examples of zinc compounds include acid zinc salts and zinc oxide.
Among these, as a zinc compound, the zinc salt of an acid is good from a viewpoint of improving the impact resistance and concealment property of a resin molding.

Examples of the acid zinc salt include inorganic acid zincs such as zinc sulfate, zinc nitrate, and zinc phosphate; and aliphatic carboxylates such as zinc stearate, zinc oleate, zinc octoate, and zinc palmitate; And zinc aromatic carboxylic acid such as zinc benzoate, zinc salicylate, zinc 4-hydroxybenzoate, zinc 4-hydroxymethylbenzoate and zinc t-butylbenzoate.
Among these, as the zinc salt of acid, zinc phosphate and zinc stearate are preferable from the viewpoint of suppressing the decrease in dispersibility of the titanium compound and improving the impact resistance and concealing property of the resin molded body.

The content Cz of the zinc element derived from the zinc compound is 0.2 ppm or more and 10 ppm or less, preferably 0.2 ppm or more and 5 ppm or less, more preferably 0.2 ppm or more and 2 ppm or less with respect to the entire resin composition.
If the content Cz of the zinc element is less than the above range and exceeds the above range, aggregation of the titanium compound is likely to occur, and the concealability of the resin molded product is lowered.

  In order to make the content Cz of the zinc element within the above range, for example, when converted to the content of zinc phosphate as the zinc compound, it is 0.39 ppm or more and 20 ppm or less (preferably with respect to the entire resin composition). When converted to the content of zinc stearate as a zinc compound, it is 1.9 ppm to 95 ppm (preferably 1.9 ppm to 48 ppm).

(Other ingredients)
The resin composition according to this embodiment may contain other components.
Other components include, for example, a compatibilizer, a plasticizer, an antioxidant, a mold release agent, a light resistance agent, a weather resistance agent, a colorant, a pigment, a modifier, an antistatic agent, an anti-hydrolysis agent, a filler, And reinforcing agents (glass fiber, carbon fiber, talc, clay, mica, glass flake, milled glass, glass bead, crystalline silica, alumina, silicon nitride, alumina nitride, boron nitride, etc.).
The content of other components is preferably 0% by mass or more and 10% by mass or less, and preferably 0% by mass or more and 5% by mass or less with respect to the entire resin composition. Here, “0 mass%” means that other components are below the detection limit.

(Characteristics of resin composition)
In the resin composition according to this embodiment, the mercury content is preferably 100 ppm or less with respect to the entire resin composition. That is, it is preferable to reduce the mercury content to 100 ppm or less with respect to the entire resin composition.

  Here, mercury is likely to be present as, for example, an impurity of a catalyst during polymerization of a resin and an impurity of titanium oxide during the production of titanium oxide. And as these impurities, mercury is contained in a resin composition. Mercury can exist in the form of oxides, carbonates, amalgams with metals, but these colors are not necessarily the same and may change over time, so that the desired color ( For example, a change may be caused from white due to titanium oxide). In particular, when the resin molded body is recycled, the difference due to the color change may be easily recognized.

For this reason, when the mercury content is within the above range, the color change of the resulting resin molded body over time is suppressed. As a result, even when the resin molded body is recycled, it becomes easy to obtain a recycled resin molded body in which color change is suppressed.
In addition, the lower the mercury content, the better. For example, it is preferably 50 ppm or less, more preferably 20 ppm or less.

  In order to make the mercury content within the above range, for example, in the method for producing titanium oxide of a titanium compound, the amount of mercury in titanium oxide is reduced by increasing the number of times of precipitation and neutralization washing. The method of mix | blending with a resin composition is mentioned. Moreover, the method of reducing the catalyst amount at the time of superposition | polymerization of resin is also mentioned.

(Production method of resin composition)
The resin composition according to this embodiment is produced by melting and kneading the above components.
Here, a known means can be used as the melt kneading means, and examples thereof include a twin screw extruder, a Henschel mixer, a Banbury mixer, a single screw extruder, a multi-screw extruder, and a kneader.

[Resin molding]
The resin molding which concerns on this embodiment is comprised including the resin composition which concerns on the said this embodiment. Specifically, the resin molded body according to the present embodiment is obtained by molding the resin composition according to the present embodiment.
For example, the resin composition according to the present embodiment is molded by a molding method such as injection molding, extrusion molding, blow molding, hot press molding, calendar molding, coating molding, cast molding, dipping molding, vacuum molding, transfer molding, The resin molding which concerns on this embodiment is obtained.

  Here, as a molding temperature (for example, extrusion temperature, injection temperature) of the resin composition concerning the above-mentioned embodiment, it is good that it is 180 ° C or more and 230 ° C or less, for example.

  The injection molding may be performed by using a commercially available apparatus such as NEX500, NEX150 manufactured by Nissei Plastic Industry, NEX70000 manufactured by Nissei Plastic Industry, SE50D manufactured by Toshiba Machine. At this time, the cylinder temperature is preferably in the range of 170 ° C. or higher and 230 ° C. or lower, and more preferably in the range of 180 ° C. or higher and 230 ° C. or lower, from the viewpoint of suppressing decomposition of the resin. The mold temperature is preferably in the range of 30 ° C. to 100 ° C., more preferably in the range of 30 ° C. to 60 ° C. from the viewpoint of productivity.

  The resin molded body according to the present embodiment is suitably used for applications such as electronic / electrical equipment, home appliances, containers, automobile interior materials, and the like. More specifically, housings such as home appliances and electronic / electrical equipment, various parts, wrapping films, storage cases such as CD-ROMs and DVDs, tableware, food trays, beverage bottles, chemical wrap materials, etc. Especially, it is suitable for parts of electronic / electric equipment.

FIG. 1 is an external perspective view of an image forming apparatus, which is an example of a part of an electronic / electric device provided with a molded body according to the present embodiment, as viewed from the front side.
The image forming apparatus 100 in FIG. 1 includes front covers 120 a and 120 b on the front surface of the main body device 110. These front covers 120a and 120b can be freely opened and closed so that an operator can operate the inside of the apparatus. Thus, the operator replenishes the toner when the toner is exhausted, replaces the exhausted process cartridge, or removes the jammed paper when a paper jam occurs in the apparatus. FIG. 1 shows the apparatus with the front covers 120a and 120b opened.

  On the upper surface of the main unit 110, an operation panel 130 on which various conditions relating to image formation such as a paper size and the number of copies are input by an operation of an operator, and a copy glass 132 on which a document to be read is arranged are provided. Yes. In addition, the main body device 110 includes an automatic document conveying device 134 that conveys a document on the copy glass 132 at the top thereof. Further, main device 110 includes an image reading device that scans a document image placed on copy glass 132 and obtains image data representing the document image. Image data obtained by the image reading apparatus is sent to the image forming unit via the control unit. Note that the image reading device and the control unit are housed in a housing 150 that forms part of the main body device 110. The image forming unit is provided in the housing 150 as a detachable process cartridge 142. The process cartridge 142 is attached and detached by turning the operation lever 144.

  A toner container 146 is attached to the casing 150 of the main body device 110, and toner is replenished from the toner supply port 148. The toner stored in the toner storage unit 146 is supplied to the developing device.

  On the other hand, sheet storage cassettes 140a, 140b, and 140c are provided at the lower portion of the main unit 110. In addition, the main body apparatus 110 has a plurality of conveying rollers formed of a pair of rollers arranged in the apparatus, thereby forming a conveying path through which the sheets of the sheet storage cassette are conveyed to the upper image forming unit. ing. The paper in each paper storage cassette is taken out one by one by a paper take-out mechanism disposed near the end of the transport path and sent out to the transport path. Further, a manual paper supply unit 136 is provided on a side surface of the main apparatus 110, and paper is supplied from here.

  The paper on which the image is formed by the image forming unit is sequentially transferred between two fixing rolls that are supported by a casing 152 that forms part of the main body device 110 and is in contact with each other. Paper is discharged to the outside. The main body device 110 is provided with a plurality of paper discharge sections 138 on the side opposite to the side where the paper supply section 136 is provided, and the paper after image formation is discharged to these paper discharge sections.

  In the image forming apparatus 100, for example, the resin molded body according to the present embodiment is used for the front covers 120a and 120b, the exterior of the process cartridge 142, the casing 150, and the casing 152.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, “part” means “part by mass”.

Here, the volume average particle diameter of titanium oxide was measured using a laser diffraction particle size distribution measuring apparatus (LA-700: manufactured by Horiba, Ltd.). As a measuring method, a sample in a dispersion was adjusted to have a solid content of about 2 g, and ion exchange water was added thereto to make about 40 ml. Further, this is put into the cell until an appropriate concentration is reached, and after waiting for about 2 minutes, the concentration is measured when the concentration in the cell becomes almost stable. The obtained volume average particle diameter for each channel was accumulated from the smaller volume average particle diameter, and the volume average particle diameter was determined to be 50%.
When measuring hydrophobized titanium oxide, 2 g of a measurement sample is added to 50 ml of a surfactant, preferably 5% aqueous solution of sodium alkylbenzenesulfonate, and dispersed for 2 minutes with an ultrasonic disperser (1000 Hz). A sample was prepared and measured by the same method as that for the above-mentioned dispersion.

<Production of titanium oxide>
(Preparation of titanium oxide 1)
100 parts of ilmenite ore was dissolved in 900 parts of sulfuric acid to generate titanyl sulfate. This was extracted with water and cooled to separate the iron. This was heated and hydrolyzed to generate a sulfuric acid dispersion of titanium hydroxide. Next, this was filtered, and as step A, dispersed in 300 parts of water, and sulfuric acid was added to adjust the pH to 3. As a B process, it filtered after that and adjusted pH to 7 using sodium hydroxide. Thereafter, filtration was performed as Step C. This process of AC was repeated 5 times. Thereafter, it was baked at 450 ° C., pulverized after cooling, and titanium oxide 1 having a volume average particle size of 0.1 μm was produced.

(Preparation of titanium oxide 2)
10 parts of titanium oxide and 2 parts of isobutyltrimethoxysilane were added to ethanol and heated. After the solvent was distilled off, the mixture was further heated to 120 ° C. for 1 hour, cooled and then ground in a jet mill to obtain a volume average. Titanium oxide 2 having a particle size of 0.1 μm was produced.

(Production of titanium oxide 3)
Titanium oxide 3 was produced in the same manner as titanium oxide 2 except that the steps A to C were made four times in the production of titanium oxide 2.

(Preparation of titanium oxide 4)
Titanium oxide 4 was produced in the same manner as titanium oxide 2 except that steps A to C were performed twice in the production of titanium oxide 2.

(Preparation of titanium oxide 5)
Titanium oxide 5 was produced in the same manner as titanium oxide 2 except that steps A to C were performed once in production of titanium oxide 2.

<Preparation of resin composition>
(Preparation of resin composition 1)
Polycarbonate resin (PC resin): 100 parts of “Iupilon H-3000” (made by Idemitsu Petrochemical Co., Ltd.), 8.8 parts of titanium oxide 2 and 0.0052 parts of zinc stearate (made by Wako Pure Chemical Industries, Ltd.) These kneaded components were kneaded using a biaxial kneader (product name “TEM-H” manufactured by Toshiba Machine), and then cooled to obtain a kneaded product. The kneaded product was crushed, and further, 810 parts of the polycarbonate resin (PC resin) and acrylonitrile / butadiene / styrene resin (ABS resin): 81.2 parts of “ABS150” (manufactured by Technopolymer Co., Ltd.) were added as post-additions. After kneading again, the mixture was cooled to obtain a resin composition 1. The kneading was performed at a cylinder temperature of 230 ° C.

(Preparation of resin composition 2)
In the production of the resin composition 1, a resin composition 2 was obtained in the same manner as the production of the resin composition 1 except that the PC resin added later was changed to 790 parts and the ABS resin was changed to 101.2 parts.

(Preparation of resin composition 3)
Resin composition 3 was obtained in the same manner as in the preparation of resin composition 1 except that, in the preparation of resin composition 1, the PC resin added later was changed to 510 parts and the ABS resin was changed to 381.2 parts.

(Preparation of resin composition 4)
Resin composition 4 was obtained in the same manner as in the preparation of resin composition 1 except that the resin added later was changed to 490 parts of the PC resin and 401.2 parts of the ABS resin.

(Preparation of resin composition 5)
Resin composition 5 was obtained in the same manner as in the preparation of resin composition 1 except that the PC resin added later was changed to 415 parts and the ABS resin was changed to 476.2 parts in the preparation of resin composition 1.

(Preparation of resin composition 6)
Resin composition 6 was obtained in the same manner as in the preparation of resin composition 1 except that the resin to be added later was changed to 390 parts and the ABS resin was changed to 501.2 parts in the preparation of resin composition 1.

(Preparation of resin composition 7)
Resin composition 7 was obtained in the same manner as in the production of resin composition 1 except that titanium oxide 2 was changed to titanium oxide 3 in the production of resin composition 1.

(Preparation of resin composition 8)
Resin composition 8 was obtained in the same manner as in the production of resin composition 1 except that titanium oxide 2 was changed to titanium oxide 4 in the production of resin composition 1.

(Preparation of resin composition 9)
Resin composition 9 was obtained in the same manner as resin composition 1 except that titanium oxide 2 was changed to titanium oxide 5 in the preparation of resin composition 1.

(Preparation of resin composition 10)
In the production of the resin composition 7, the resin composition 10 was obtained in the same manner as in the production of the resin composition 7 except that the titanium oxide 3 was changed to 16.8 parts and the ABS resin to be added later was changed to 73.2 parts. It was.

(Preparation of resin composition 11)
In the production of the resin composition 8, the resin composition 11 was obtained in the same manner as in the production of the resin composition 8 except that the titanium oxide 4 was changed to 16.8 parts and the ABS resin to be added later was changed to 73.2 parts. It was.

(Preparation of resin composition 12)
In the production of the resin composition 9, the resin composition 12 was obtained in the same manner as the production of the resin composition 9 except that the titanium oxide 5 was changed to 16.8 parts and the ABS resin to be added later was changed to 73.2 parts. It was.

(Preparation of resin composition 13)
In the production of the resin composition 1, a resin composition 13 is obtained in the same manner as in the production of the resin composition 1 except that the ABS resin to be added later is changed to an aromatic polyester resin: “Pyropet EMC405A” (manufactured by Toyobo Co., Ltd.). It was.

(Preparation of resin composition 14)
Resin composition 14 was obtained in the same manner as in the preparation of resin composition 1 except that the ABS resin added later was changed to polypropylene resin: “NOVATEC PP” (manufactured by Nippon Polypropylene) in the preparation of resin composition 1.

(Production of resin compositions 15 to 40)
Resin compositions 15 to 40 were prepared in the same manner as the resin composition 1 except that the resin composition 1 was made of a PC resin, an ABS resin, titanium oxide, and zinc stearate as shown in Table 1.

(Production of resin compositions 41 to 67)
In the production of the resin composition 1, the resin compositions 41 to 41 are the same as the resin composition 1 except that the PC resin, ABS resin, titanium oxide, and zinc phosphate (manufactured by Wako Pure Chemical Industries, Ltd.) have the composition shown in Table 2. 67 was produced.

(Production of resin compositions 68 to 94)
Resin compositions 68 to 94 are the same as resin composition 1 except that PC resin, ABS resin, titanium oxide, and zinc sulfate (manufactured by Wako Pure Chemical Industries, Ltd.) have the composition shown in Table 3 in the production of resin composition 1. Was made.

(Preparation of resin composition 95)
PC resin: 910 parts “Iupilon H-3000” (Idemitsu Petrochemical Co., Ltd.), ABS resin: 81.2 parts “ABS150” (Technopolymer Co., Ltd.), 8.8 parts of titanium oxide 2, zinc stearate ( 0.0052 parts of Wako Pure Chemical Industries, Ltd.) were kneaded using a biaxial kneader (manufactured by Toshiba Machine, product name “TEM-H”), and then cooled to obtain a kneaded product. The kneading was performed at a cylinder temperature of 230 ° C.

<Examples 1 to 71, Comparative Examples 1 to 24>
The following measurements and evaluations were performed on each of the resin compositions 1 to 94. The results are shown in Tables 4-6.

(Measurement of content of each element in each resin composition)
Titanium element content Ct, zinc element content Cz, and mercury content in each resin composition were measured.
The content of the target element of each resin composition was quantified and measured using fluorescent X-ray analysis. Hereinafter, a method for determining the element content using fluorescent X-ray analysis will be described.

First, the measurement sample was prepared as follows.
The sample of the resin composition was determined by the collimator size of the fluorescent X-ray apparatus, and was larger than the X-ray irradiation area and smaller than the sample stage. The thickness of the resin composition sample was set to 5 mm or more and 10 mm or less from the saturated thickness with respect to X-rays. In the case where the rough shape, thickness, and surface shape of the sample were not uniform, it was formed into a disk shape by pressure molding after pulverization by a pulverization process (vibration mill, mortar, etc.).

The fluorescent X-ray analyzer may be either an energy dispersive type or a wavelength dispersive type. In this example, an energy dispersive X-ray fluorescent analyzer EDX720 (manufactured by Shimadzu Corporation) was used.
As measurement conditions, an anode was set to rhodium and a voltage was set to 50 kv as a tube bulb, and a calibration curve method was selected as a quantification method.

In addition, the standard sample registered in the calibration curve was selected from certified standard substances close to the specific gravity of the substrate resin in the target constituent material.
In preparing a calibration curve, the X-ray intensity in the target element analysis line or the X-ray intensity ratio obtained by correcting the X-ray intensity with the background intensity or characteristic X-ray intensity with respect to the certified value (weight ratio) of the standard substance The relational expression was registered as a calibration curve expression.

[Charpy impact strength]
Each resin composition was injection molded using an injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd., product name “NEX5000”) at a cylinder temperature of 220 ° C. and a mold temperature of 50 ° C., and an ISO multipurpose dumbbell specimen (ISO 527 tensile test). , A test piece corresponding to the ISO 178 bending test, a thickness of the test portion of 4 mm, and a width of 10 mm) was produced.
The obtained ISO multi-purpose dumbbell test piece was notched and subjected to Charpy impact strength (kJ / m ² ) using an impact resistance test device (DG-C, manufactured by Toyo Seiki Co., Ltd.) according to the method prescribed in ISO-179. ) Was measured.
The evaluation criteria are as follows.
G4: 10 kJ / cm ² or more G3: 5 kJ / cm ² or more 10 kJ / cm ² less than G2: 2 kJ / cm ² or more 5 kJ / cm ² less than G1: 2 kJ / cm less than ²

[Concealment]
Each resin composition was injection molded at a cylinder temperature of 220 ° C. and a mold temperature of 50 ° C. using an injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd., product name “NEX5000”) to prepare a resin sheet.
On the other hand, a transparent film on which an image was formed so that the letters “A” of 3 mm in length and width were 30 characters per line and 30 columns was produced.
Place the resin sheet on the image on the prepared transparent film, set it on the translucent stand, and irradiate it with a fluorescent lamp from the back of the transparent film. The letter “A” on the transparent film passes through the resin sheet. I was able to read it.
The evaluation criteria are as follows.
G4: Characters cannot be confirmed at all.
G3: Some characters can be confirmed.
G2: The character-like object can be recognized as a whole but cannot be read.
Even G1: 1, it can be recognized that the character is “A”.

[Recyclability]
The resin sheet produced by the evaluation of concealment was processed, and the degree of discoloration was confirmed under ultraviolet irradiation. As a light source for irradiating ultraviolet rays, a sunshine weather meter for light resistance test (WEL-SUN-HC manufactured by Suga Test Instruments Co., Ltd.) was used, irradiation intensity: 1000 W, irradiation time: 120 hours, temperature: 60 ° C., humidity: 50% Distance between RH and light source: 100 mm. After the irradiation test, the color was compared with the resin sheet before irradiation.
The evaluation criteria are as follows.
G4: The color difference cannot be confirmed.
G3: A slight color difference is recognized partially.
G2: A slight color difference is recognized throughout.
G1: A clear color difference is recognized.

From the above results, it can be seen that in this example, better results were obtained for both the impact resistance and the hiding property evaluation than the comparative example.
Moreover, it turns out that the favorable result is obtained about the evaluation of recyclability in the example in which the amount of mercury is reduced among the present examples.

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 110 Main body apparatus 120a, 120b Front cover 136 Paper supply part 138 Paper discharge part 142 Process cartridge 150, 152 Case

The above object is achieved by the present invention described below.
That is, the invention according to claim 1
A polycarbonate resin, a titanium oxide that is a titanium compound, and a zinc salt of an acid that is a zinc compound,
The content of the polycarbonate resin is 50% by mass or more based on the entire resin composition,
The content Ct of titanium element derived from the titanium compound is 0.1% by mass or more and 5% by mass or less with respect to the entire resin composition,
The resin composition whose content Cz of the zinc element derived from the said zinc compound is 0.2 ppm or more and 10 ppm or less with respect to the whole resin composition.

The invention according to claim 3
Resin molded body that is configured to include a resin composition according to claim 1 or 2.

According to the invention according to claim 1 , in the resin composition containing the polycarbonate resin, the titanium compound, and the zinc compound, the content Ct of the titanium element derived from the titanium compound or the content Cz of the zinc element derived from the zinc compound is Compared to a case outside the above range, a resin composition excellent in impact resistance and concealment property of the obtained resin molding can be provided.
According to the invention which concerns on Claim 2, compared with the case where mercury contains more than 100 ppm with respect to the whole resin composition, the resin composition by which the color change with time of the obtained resin molding was suppressed can be provided.

[Resin composition]
The resin composition according to the present embodiment includes a polycarbonate, a titanium compound, and a zinc compound.
And content Ct of the titanium element derived from a titanium compound is 0.1 to 5 mass% with respect to the whole resin composition.
Moreover, content Cz of the zinc element derived from a zinc compound is 0.2 ppm or more and 10 ppm or less with respect to the whole resin composition.
However, in the resin composition according to the present embodiment, the content of the polycarbonate resin is 50% by mass or more based on the entire resin composition, and the resin composition includes titanium oxide as the titanium compound and the zinc salt of the acid as the zinc compound. Applies.

Claims (5)

A polycarbonate resin, a titanium compound, and a zinc compound,
The content Ct of titanium element derived from the titanium compound is 0.1% by mass or more and 5% by mass or less with respect to the entire resin composition,
The resin composition whose content Cz of the zinc element derived from the said zinc compound is 0.2 ppm or more and 10 ppm or less with respect to the whole resin composition.   The resin composition according to claim 1, wherein the mercury content is 100 ppm or less based on the entire resin composition.   The resin composition according to claim 1, wherein the titanium compound is titanium oxide.   The resin composition according to any one of claims 1 to 3, wherein the zinc compound is a zinc salt of an acid.   The resin molded object comprised including the resin composition of any one of Claims 1-4.